Celluloid compound and process of making same.



' volatilize.

UNITED STATES Patented June z, 1903.

Price.

PATENT ERNST ZUHL, or BERLIN, GERMANY.

SFEGIFICATION forming part of Letters Patent No. 729,990, dated June 2,1903. Allplicfllfion filed Novembel 1902, Serial No. 1301857- (Nospecimens.)

1'0 all Mill 0770 it may concern:

Be it known that I, ERNST ZiiHL, doctor of philosophy, asubject of theGerman Emperor, and a resident of 95 Belle-Alliancestrasse, in the cityof Berlin, in the Empire of Germany, have invented certain new anduseful Improvements in Celluloid Compounds and Process of Making Same,of whichthe following is a specification.

My invention has reference to a compound or composition which isemployed in the arts and trades for the same purpose as celluloid andsimilar compositions.

Hitherto celluloid and celluloid-like compositions were manufactured bycompounding camphor or a suitable succedaneum or substitute ofcamphoras,for instance, phosphoricacid esters, naphthyl acetate, &c.withnitrated cellulose. The use of another cellulose ester, especiallyacetylated cellulose, was prevented by the circumstance that theproducts made by combining such cellulose esters with camphor or asuccedaneum were fragile and brittle. I have discovered that suchdisadvantage is avoided by using the acetylated cellulose or anotherorganic ester of cellulose in combination with nitrated cellulose andadding to such compound the usual admixture of camphor or a substituteof same. For certain purposes-for instance, top'roduce photographicfilmsthe addition of camphor or a known succedaneum of same can beentirely omitted, only using the compound of nitrated cellulose withacetylated cellulose. In this case both these ingredients may be solvedin a usual volatile solvent, and after solving the mixture in thesolvent the latteris allowed to The use of the said compound of nitratedcellulose with acetylated cellulose or with similar cellulose estersinstead of nitrated cellulose onlyretards the combustion of thecelluloid or articles made therefrom and also enhances their elasticity.

According as the celluloid may be more or less combustible theproportions of nitrated and acetylated cellulose can be varied withinreasonable limits.

For many purposes I prefer to use the following examples of the newcomposition:

First. Seventy kilogramsof nitrated cellulose are mixed with or Withoutthe aid of an auxiliary solvent and the resulting mixture worked up inthe usual manner.

Second. Seventy kilograms of nitrated cellulose and thirty kilograms ofbutyric-acid ester of cellulose are mixed with or without the aid of anauxiliary solvent and then worked up in the usual manner.

Third. Equal parts of nitrated cellulose and acetylated cellulose andcamphor or a known succedaneum of camphor are mixed with or without theaid of an auxiliary solvent and then worked up in the usual manner.

Of course admixtures as usual in the manufacture of celluloidsuch asresins, fats, oils, casein, &c.-can be added to the resulting mixturewithout touching the essential feature of the specified invention.

What I claim is- 1. As a new article of manufacture a com position to beused as a material in the arts and trades and composed essentially of'nitrated cellulose and the esters of organic acids with cellulose, asspecified.

2. As a new article of manufacture a com position to be used as amaterial in the arts and trades and composed essentially of nitratedcellulose and acetylated cellulose, as specified.

3. As a new article of manufacture a composition to be used as amaterial in the arts position to be used as a material in the arts andtrades and composed essentially of a succedaneum of camphor in themanufacture of celluloid, and a mixture of nitrated cellulose and theesters of organic acids with cellulose, as specified.

6. As a new article of manufacture a composition to be used as amaterial in the arts and trades and composed essentially of asuccedaneum of camphor in the manufacture of celluloid and a mixture ofnitrated cellulose and acetylated cellulose, as specified.

7. The process of manufacturing an artificial material consisting incompounding nitrated cellulose with the organic esters of cellulose andthen Working the resulting mixture up into the material, as specified.

S. The process of manufacturing an artificial material consisting incompounding nitrated cellulose with acetylated cellulose and thenworking the resulting mixture up into the material, as specified.

9. The process of manufacturing an artificial material consisting incompounding a mixture of nitrated cellulose and organic esters ofcellulose with camphor and then working the resulting mixture up intothe material, as specified.

10. The process of manufacturing an artificial material consisting incompounding a mixture of nitrated cellulose and acetylated cellulosewith camphor and then working the ing the resulting mixture up into thematerial, as specified.

Signed at Paris, France, this 25th day of October, 1902.

. ERNST ZUHL. \Vitnesses:

EDWARD P. MACLEAN, GEORGE E. LIGHT.

